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Synonyms
pro·long (prə-lônǵ, -lŏnǵ)

[Middle English prolongen, from Old French prolonguer, from Late Latin prōlongāre, Latin prō-, forth; see pro–1, + Latin longus, long.]

transitive verb: -longed, -long·ing, -longs. 

  1. To lengthen in duration; protract.
  2. To lengthen in extent.

derivatives

pro·lonǵer
noun